Introduction

At one point or another, we came across variables. They’re our go-to tool for:

Storing and processing information
Doing calculations and producing an output

To illustrate this, consider a scenario where we want to read the first name, age, and email address of a user, each separated with a space in a single line. Our code will display the entered data and store it in a file (user_data.txt) for later use.

Don’t worry if you’re not familiar with working with files in C! It is just an example for us to analyze.

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#include <stdio.h>
int main()
{
    char inputBuffer[72];
    char name[32];
    int age;
    char emailAddress[32];
    fgets(inputBuffer, 72, stdin);
    sscanf(inputBuffer, "%s %d %s", name, &age, emailAddress);
    printf("Received from user: [%s] [%d] [%s]\n", name, age, emailAddress);
    FILE *filePtr = fopen("output/user_data.txt", "a");
    if (filePtr != NULL)
    {
        fprintf(filePtr, "%s %d %s\n", name, age, emailAddress);
        fclose(filePtr);
        printf("Saved user data to file!\n");
    }
    else
    {
        printf("Could not open file!\n");
    }
    return 0;
}

Introduction

Stack and Local Memory

Passing Arguments to Functions

Pointer Arithmetic Basics

Pointers and Arrays

Pointers and Strings

Pointers and Functions

Write a Shell in C

Complex Pointer Declarations

Assessment 1

Heap and Dynamic Memory

Structures

Practicing Everything with Linked Lists

Assessment 2

Genericity Using Void Pointers

Advanced Memory Manipulation

Project Prep: Binary Search Trees

Efficiently Processing Temperature Samples

Efficient Dictionary

Efficiently Processing Employee Records

Conclusion

Memory

Introduction

Asking questions